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Updated: Aug 29, 2025
08:21
Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
Published on: June 28, 2019
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Structural snapshot of a β-arrestin-biased receptor
Parishmita Sarma1, Ramanuj Banerjee1, Arun K Shukla1
1Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur 208016, India.
Trends in Pharmacological Sciences
|September 3, 2022
Summary
Atypical chemokine receptor subtype 3 (ACKR3) selectively binds β-arrestins but not G proteins. Cryo-EM structures reveal ACKR3's unique chemokine binding and transducer coupling bias.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Pharmacology
Background:
- Atypical chemokine receptor subtype 3 (ACKR3) is a seven-transmembrane (7TM) receptor.
- ACKR3 exhibits unique signaling properties, coupling to β-arrestins (βarrs) but not G proteins.
Purpose of the Study:
- To elucidate the structural basis of ACKR3's selective transducer coupling.
- To present high-resolution structures of agonist-bound ACKR3.
Main Methods:
- Cryogenic-electron microscopy (cryo-EM) was employed to determine the structures.
- Structural analysis of agonist-bound ACKR3.
Main Results:
- Detailed structures of agonist-bound ACKR3 were obtained.
- A distinct chemokine-binding mechanism for ACKR3 was elucidated.
- Structural insights into ACKR3's transducer-coupling bias were provided.
Conclusions:
- ACKR3 possesses a unique chemokine-binding mode.
- The study provides a structural template for investigating ACKR3's biased signaling.
- Understanding ACKR3 structure is crucial for developing targeted therapeutics.
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